Sliding blind loop. Tourist tips

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Sliding blind loop. Tourist tips

Tourist tips

Sliding blind loop, a simple and durable knot, can be used in everyday life for tightening various bales and bundles during their packaging. Knitting a knot is extremely simple and does not require any comments.

Rice. 84. Sliding blind loop (the cross indicates the working loop)

Author: Skryagin L.N.

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Atomic clock entanglement experiment 11.09.2022

Physicists for the first time "confused" two optical atomic clocks.

This breakthrough could be a way to go beyond even the most advanced current timekeeping limitations, as well as being a fantastic tool in the exciting field of quantum computing: quantum cryptography.

Atomic clocks are used as timers, measuring the resonant frequencies of atoms as their electrons switch between energy levels. Traditionally this has been done using cesium atoms and microwaves, but since 2000 new atoms have been used using visible light. This is an optical atomic clock that uses elements such as ytterbium, mercury and strontium.

Optical atomic clocks have recently been used to make impressive strides in accurate timekeeping. They are 100 times more accurate than traditional cesium atomic clocks. So precise that they could soon be used to redefine the second . But they also have their limitations. Especially when it takes several hours.

This optical clock is so accurate that it can test small changes in gravity, both to test theories like relativity and to study what is actually under our feet. However, these approaches require comparison of different clocks, and the accuracy of these measurements for independent devices will depend on the standard quantum limit. Keeping two atomic clocks in sync is tricky because even just measuring them can cause them to change and cause errors. But there is a way to make fewer measurements, and this is where the quantum "magic" happens.

Entanglement of atoms in two clocks makes it possible to achieve the ultimate precision allowed by quantum theory, the Heisenberg limit. The researchers report being able to do this in a system consisting of two clocks made up of a single strontium atom, each 2m apart. They reduced the uncertainty by 1,4 times.

Entanglement is a special state in which particles that we consider separate behave as part of a single system. A change in one leads to an instant change in the other, regardless of distance. The fact that this could theoretically happen between two particles at each end of the universe makes many scientists feel uneasy. Einstein called it "creepy action at a distance." But this is not a causal relationship: the particles are in a single entangled state, so when you do something with one particle (for example, by observing), you are actually affecting the entire state, even if it extends for billions of light years.

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